Trevor Bauer and Corey Kluber, two of the candidates to win the fifth starter's job in the Indians rotation, were optioned to Class AAA Columbus on Thursday morning.Left-hander Scott Kazmir and Carlos Carrasco are the two remaining contestants.Left-handers Giovanni Soto and Scott Barnes were also sent to the minors. Barnes, like Kluber and Bauer, was optioned to Columbus. Soto, just back from the World Baseball Classic, was re-assigned to minor league camp